=begin
#ruby-api-exception-contains-response-headers API

#A simple API based for testing ruby-api-exception-contains-response-headers.

The version of the OpenAPI document: 1.0.0
Contact: support@example.com
=end

require 'date'
require 'json'
require 'logger'
require 'tempfile'
require 'time'
require_relative './api_client_custom'
require 'faraday'
require 'faraday/multipart' if Gem::Version.new(Faraday::VERSION) >= Gem::Version.new('2.0')

module RubyApiExceptionContainsResponseHeaders
  class ApiClient
    # The Configuration object holding settings to be used in the API client.
    attr_accessor :config

    # Defines the headers to be used in HTTP requests of all API calls by default.
    #
    # @return [Hash]
    attr_accessor :default_headers

    # Initializes the ApiClient
    # @option config [Configuration] Configuration for initializing the object, default to Configuration.default
    def initialize(config = Configuration.default)
      @config = config
      @user_agent = "Konfig/#{VERSION}/ruby"
      @default_headers = {
        'Content-Type' => 'application/json',
        'User-Agent' => @user_agent
      }
    end

    def self.default
      @@default ||= ApiClient.new
    end

    # Call an API with given options.
    #
    # @return [Array<(Object, Integer, Hash)>] an array of 3 elements:
    #   the data deserialized from response body (could be nil), response status code and response headers.
    def call_api(http_method, path, opts = {})
      begin
        response = connection(opts).public_send(http_method.to_sym.downcase) do |req|
          build_request(http_method, path, req, opts)
        end

        if config.debugging
          config.logger.debug "HTTP response body ~BEGIN~\n#{response.body}\n~END~\n"
        end

        unless response.success?
          if response.status == 0
            # Errors from libcurl will be made visible here
            fail ApiError.new(code: 0,
                              message: response.return_message)
          else
            fail ApiError.new(code: response.status,
                              response_headers: response.headers,
                              response_body: response.body),
                 response.reason_phrase
          end
        end
      rescue Faraday::TimeoutError
        fail ApiError.new('Connection timed out')
      end

      if opts[:return_type]
        data = deserialize(response, opts[:return_type])
      else
        data = nil
      end
      return data, response.status, response.headers, response
    end

    # Builds the HTTP request
    #
    # @param [String] http_method HTTP method/verb (e.g. POST)
    # @param [String] path URL path (e.g. /account/new)
    # @option opts [Hash] :header_params Header parameters
    # @option opts [Hash] :query_params Query parameters
    # @option opts [Hash] :form_params Query parameters
    # @option opts [Object] :body HTTP body (JSON/XML)
    # @return [Faraday::Request] A Faraday Request
    def build_request(http_method, path, request, opts = {})
      url = build_request_url(path, opts)
      http_method = http_method.to_sym.downcase

      header_params = @default_headers.merge(opts[:header_params] || {})
      query_params = opts[:query_params] || {}
      form_params = opts[:form_params] || {}

      update_params_for_auth! header_params, query_params, opts[:auth_names]

      if [:post, :patch, :put, :delete].include?(http_method)
        req_body = build_request_body(header_params, form_params, opts[:body])
        if config.debugging
          config.logger.debug "HTTP request body param ~BEGIN~\n#{req_body}\n~END~\n"
        end
      end
      request.headers = header_params
      request.body = req_body

      # Overload default options only if provided
      request.options.params_encoder = config.params_encoder if config.params_encoder
      request.options.timeout        = config.timeout        if config.timeout

      request.url url
      request.params = query_params
      download_file(request) if opts[:return_type] == 'File' || opts[:return_type] == 'Binary'

      ApiClientCustom.request_hook(request, @config)

      request
    end

    # Builds the HTTP request body
    #
    # @param [Hash] header_params Header parameters
    # @param [Hash] form_params Query parameters
    # @param [Object] body HTTP body (JSON/XML)
    # @return [String] HTTP body data in the form of string
    def build_request_body(header_params, form_params, body)
      # http form
      if header_params['Content-Type'] == 'application/x-www-form-urlencoded'
        data = URI.encode_www_form(form_params)
      elsif header_params['Content-Type'] == 'multipart/form-data'
        data = {}
        form_params.each do |key, value|
          case value
          when ::File, ::Tempfile
            # TODO hardcode to application/octet-stream, need better way to detect content type
            data[key] = Faraday::FilePart.new(value.path, 'application/octet-stream', value.path)
          when ::Array, nil
            # let Faraday handle Array and nil parameters
            data[key] = value
          else
            data[key] = value.to_s
          end
        end
      elsif body
        data = body.is_a?(String) ? body : body.to_json
      else
        data = nil
      end
      data
    end

    def download_file(request)
      @stream = []

      # handle streaming Responses
      request.options.on_data = Proc.new do |chunk, overall_received_bytes|
        @stream << chunk
      end
    end

    def connection(opts)
      opts[:header_params]['Content-Type'] == 'multipart/form-data' ? connection_multipart : connection_regular
    end

    def connection_multipart
      @connection_multipart ||= build_connection do |conn|
        conn.request :multipart
        conn.request :url_encoded
      end
    end

    def connection_regular
      @connection_regular ||= build_connection
    end

    def build_connection
      Faraday.new(url: config.base_url, ssl: ssl_options) do |conn|
        config.configure_middleware(conn)
        yield(conn) if block_given?
        conn.adapter(Faraday.default_adapter)
      end
    end

    def ssl_options
      {
        ca_file: config.ssl_ca_file,
        verify: config.ssl_verify,
        verify_mode: config.ssl_verify_mode,
        client_cert: config.ssl_client_cert,
        client_key: config.ssl_client_key
      }
    end

    # Check if the given MIME is a JSON MIME.
    # JSON MIME examples:
    #   application/json
    #   application/json; charset=UTF8
    #   APPLICATION/JSON
    #   */*
    # @param [String] mime MIME
    # @return [Boolean] True if the MIME is application/json
    def json_mime?(mime)
      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
    end

    # Deserialize the response to the given return type.
    #
    # @param [Response] response HTTP response
    # @param [String] return_type some examples: "User", "Array<User>", "Hash<String, Integer>"
    def deserialize(response, return_type)
      body = response.body

      # handle file downloading - return the File instance processed in request callbacks
      # note that response body is empty when the file is written in chunks in request on_body callback
      if return_type == 'File'
        if @config.return_binary_data == true
          # return byte stream
          encoding = body.encoding
          return @stream.join.force_encoding(encoding)
        else
          # return file instead of binary data
          content_disposition = response.headers['Content-Disposition']
          if content_disposition && content_disposition =~ /filename=/i
            filename = content_disposition[/filename=['"]?([^'"\s]+)['"]?/, 1]
            prefix = sanitize_filename(filename)
          else
            prefix = 'download-'
          end
          prefix = prefix + '-' unless prefix.end_with?('-')
          encoding = body.encoding
          @tempfile = Tempfile.open(prefix, @config.temp_folder_path, encoding: encoding)
          @tempfile.write(@stream.join.force_encoding(encoding))
          @tempfile.close
          @config.logger.info "Temp file written to #{@tempfile.path}, please copy the file to a proper folder "\
                              "with e.g. `FileUtils.cp(tempfile.path, '/new/file/path')` otherwise the temp file "\
                              "will be deleted automatically with GC. It's also recommended to delete the temp file "\
                              "explicitly with `tempfile.delete`"
          return @tempfile
        end
      end

      return nil if body.nil? || body.empty?

      # return response body directly for String return type
      return body if return_type == 'String'

      # ensuring a default content type
      content_type = response.headers['Content-Type'] || 'application/json'

      fail "Content-Type is not supported: #{content_type}" unless json_mime?(content_type)

      begin
        data = JSON.parse("[#{body}]", :symbolize_names => true)[0]
      rescue JSON::ParserError => e
        if %w(String Date Time).include?(return_type)
          data = body
        else
          raise e
        end
      end

      convert_to_type data, return_type
    end

    # Convert data to the given return type.
    # @param [Object] data Data to be converted
    # @param [String] return_type Return type
    # @return [Mixed] Data in a particular type
    def convert_to_type(data, return_type)
      return nil if data.nil?
      case return_type
      when 'String'
        data.to_s
      when 'Integer'
        data.to_i
      when 'Float'
        data.to_f
      when 'Boolean'
        data == true
      when 'Time'
        # parse date time (expecting ISO 8601 format)
        Time.parse data
      when 'Date'
        # parse date time (expecting ISO 8601 format)
        Date.parse data
      when 'Object'
        # generic object (usually a Hash), return directly
        data
      when /\AArray<(.+)>\z/
        # e.g. Array<Pet>
        sub_type = $1
        data.map { |item| convert_to_type(item, sub_type) }
      when /\AHash\<String, (.+)\>\z/
        # e.g. Hash<String, Integer>
        sub_type = $1
        {}.tap do |hash|
          data.each { |k, v| hash[k] = convert_to_type(v, sub_type) }
        end
      else
        # models (e.g. Pet) or oneOf
        klass = RubyApiExceptionContainsResponseHeaders.const_get(return_type)
        klass.respond_to?(:openapi_one_of) ? klass.build(data) : klass.build_from_hash(data)
      end
    end

    # Sanitize filename by removing path.
    # e.g. ../../sun.gif becomes sun.gif
    #
    # @param [String] filename the filename to be sanitized
    # @return [String] the sanitized filename
    def sanitize_filename(filename)
      filename.gsub(/.*[\/\\]/, '')
    end

    def build_request_url(path, opts = {})
      # Add leading and trailing slashes to path
      path = "/#{path}".gsub(/\/+/, '/')
      @config.base_url(opts[:operation]) + path
    end

    # Update header and query params based on authentication settings.
    #
    # @param [Hash] header_params Header parameters
    # @param [Hash] query_params Query parameters
    # @param [String] auth_names Authentication scheme name
    def update_params_for_auth!(header_params, query_params, auth_names)
      Array(auth_names).each do |auth_name|
        auth_setting = @config.auth_settings[auth_name]
        next unless auth_setting
        value = auth_setting[:value]
        next unless value
        case auth_setting[:in]
        when 'header' then header_params[auth_setting[:key]] = value
        when 'query'  then query_params[auth_setting[:key]] = value
        else fail ArgumentError, 'Authentication token must be in `query` or `header`'
        end
      end
    end

    # Sets user agent in HTTP header
    #
    # @param [String] user_agent User agent (e.g. Konfig/ruby/1.0.0)
    def user_agent=(user_agent)
      @user_agent = user_agent
      @default_headers['User-Agent'] = @user_agent
    end

    # Return Accept header based on an array of accepts provided.
    # @param [Array] accepts array for Accept
    # @return [String] the Accept header (e.g. application/json)
    def select_header_accept(accepts)
      return nil if accepts.nil? || accepts.empty?
      # use JSON when present, otherwise use all of the provided
      json_accept = accepts.find { |s| json_mime?(s) }
      json_accept || accepts.join(',')
    end

    # Return Content-Type header based on an array of content types provided.
    # @param [Array] content_types array for Content-Type
    # @return [String] the Content-Type header  (e.g. application/json)
    def select_header_content_type(content_types)
      # return nil by default
      return if content_types.nil? || content_types.empty?
      # use JSON when present, otherwise use the first one
      json_content_type = content_types.find { |s| json_mime?(s) }
      json_content_type || content_types.first
    end

    # Convert object (array, hash, object, etc) to JSON string.
    # @param [Object] model object to be converted into JSON string
    # @return [String] JSON string representation of the object
    def object_to_http_body(model)
      return model if model.nil? || model.is_a?(String)
      local_body = nil
      if model.is_a?(Array)
        local_body = model.map { |m| object_to_hash(m) }
      else
        local_body = object_to_hash(model)
      end
      local_body.to_json
    end

    # Convert object(non-array) to hash.
    # @param [Object] obj object to be converted into JSON string
    # @return [String] JSON string representation of the object
    def object_to_hash(obj)
      if obj.respond_to?(:to_hash)
        obj.to_hash
      else
        obj
      end
    end

    # Build parameter value according to the given collection format.
    # @param [String] collection_format one of :csv, :ssv, :tsv, :pipes and :multi
    def build_collection_param(param, collection_format)
      case collection_format
      when :csv
        param.join(',')
      when :ssv
        param.join(' ')
      when :tsv
        param.join("\t")
      when :pipes
        param.join('|')
      when :multi
        # return the array directly as typhoeus will handle it as expected
        param
      else
        fail "unknown collection format: #{collection_format.inspect}"
      end
    end
  end

  # Represents an HTTP response for method that end with *_with_http_info
  class APIResponse
    # [Object] deserialized data
    attr_reader :data
    # [Integer] response status code
    attr_reader :status_code
    # [Hash] response headers
    attr_reader :headers
    # [Faraday::Response] the original Faraday response object
    attr_reader :response

    def initialize(data, status_code, headers, response)
      @data = data
      @status_code = status_code
      @headers = headers
      @response = response
    end

  end
end
